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Rifle Parts

Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more. 

Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.

Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.

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Items 65-80 of 104

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  6. KNS Precision AR15 AR/MCX Stock Adapter With Flange
    KNS Precision AR15 AR/MCX Stock Adapter With Flange
    $51.00
    Out of stock
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  8. Aeroknox AX // Foregrip - M-LOK
    Aeroknox AX // Foregrip - M-LOK
    $50.00
    Out of stock
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  10. Ergo Suregrip Tactical Deluxe with Palm Shelf
    Ergo Suregrip Tactical Deluxe with Palm Shelf
    $51.99
    Out of stock
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  11. Noveske Lo Pro Gas Block .625
    Noveske Lo Pro Gas Block .625
    $58.90
    Out of stock
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  12. A3 Tactical Angled Foregrip - CZ Scorpion Micro
    A3 Tactical Angled Foregrip - CZ Scorpion Micro
    $56.95
    Out of stock
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  13. Armaspec Sound Mitigation Buffer Gen 3
    Armaspec Sound Mitigation Buffer Gen 3
    Out of stock
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  14. V Seven Weapon Systems Titanium Mag Catch / Release
    V Seven Weapon Systems Titanium Mag Catch / Release
    $50.44
    Out of stock
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  15. Fortis MFG Shift Fore-End Vertical Grip M-LOK
    Fortis MFG Shift Fore-End Vertical Grip M-LOK
    $56.95
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Items 65-80 of 104

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Barrel Length
  1. 3.1" 1 item
  2. 10.3" 1 item
  3. 16" 5 items
Caliber
  1. 5.56 NATO 1 item
  2. 5.56mm 1 item
  3. 7.62x51 2 items
  4. 8.6 Blackout 1 item
  5. 9mm 4 items
Category
  1. Receiver Parts 2 items
  2. Parts & Kits 27 items
  3. Barrels 1 item
  4. Buffer Systems 9 items
  5. Trigger Parts 3 items
  6. Gas Systems 4 items
  7. Muzzle Devices 17 items
  8. Bolt Parts 1 item
  9. Grips 14 items
  10. Charging Handles 9 items
  11. Rifle Handguards 4 items
  12. Stocks & Braces 13 items
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Configuration
  1. M-LOK 1 item
  2. .750 DIA 1 item
  3. Large Latch 1 item
  4. Medium Latch 1 item
  5. Small Latch 1 item
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Gas Block Diameter
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  2. .750" 2 items
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  1. A3 Tactical 2 items
  2. Accu-Tac 1 item
  3. Aero Precision 1 item
  4. Aeroknox 1 item
  5. Angstadt Arms 4 items
  6. Apex Tactical Specialties 2 items
  7. Armaspec 1 item
  8. Ascalon Arms 1 item
  9. B5 Systems 1 item
  10. Battle Arms Development 3 items
  11. Bravo Company MFG (BCM) 2 items
  12. Centurion Arms 1 item
  13. Cobalt Kinetics 1 item
  14. Emissary Development 2 items
  15. Ergo Grips 1 item
  16. Faxon Firearms 2 items
  17. Fortis MFG 6 items
  18. Forward Controls Design 11 items
  19. Griffin Armament 2 items
  20. HB Industries 2 items
  21. JL Billet 1 item
  22. JMAC Customs 5 items
  23. JP Enterprises Inc 1 item
  24. Kinetic Development Group 1 item
  25. KNS Precision 2 items
  26. Lantac 1 item
  27. Magpul Industries 2 items
  28. Next Level Armament 2 items
  29. NIGHT FISION 1 item
  30. Noveske 5 items
  31. Odin Works 1 item
  32. Patriot Ordnance Factory (POF) 1 item
  33. Radian Weapons 1 item
  34. Rainier Arms, LLC 4 items
  35. Rehv Arms 1 item
  36. Rise Armament 1 item
  37. SB Tactical 2 items
  38. Sionics Weapon Systems 1 item
  39. Sons of Liberty Gun Works 1 item
  40. Spinta Precision 1 item
  41. Stern Defense 1 item
  42. Strike Industries 3 items
  43. Torrent Suppressors 2 items
  44. Troy Industries 1 item
  45. TruCalibre 1 item
  46. True North Concepts 1 item
  47. Tyrant Designs 1 item
  48. V Seven Weapon Systems 2 items
  49. VLTOR 6 items
  50. White Label Armory 1 item
Model
  1. CZ Scorpion 1 item
  2. FNH 509 1 item
  3. Sig MCX 1 item
Mount
  1. KeyMod 5 items
  2. M-LOK 9 items
  3. Picatinny 6 items
Option
  1. AR-15 13 items
  2. Long 1 item
  3. CZ 4 items
  4. FNH 1 item
  5. Non-Adjustable 3 items
  6. Dimpled 1 item
  7. Serrated 2 items
Platform
  1. AR-9 1 item
  2. AR-10/LR308 1 item
  3. AR-15 5 items
  4. CZ 1 item
  5. FNH 1 item
  6. H&K 1 item
  7. Sig Sauer 1 item
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 1 item
  4. AR-15 Barrel 1 item
  5. AR-15 Charging Handle 2 items
  6. AR-15 Stripped Upper Receiver 1 item
  7. Bolt Catch 9 items
  8. Brace 2 items
  9. Buffer 5 items
  10. Buffer Kit 3 items
  11. Buffer Tube 1 item
  12. Cam Pin 1 item
  13. Castle Nut / End Plate 2 items
  14. Charging Handle 5 items
  15. Compensator 2 items
  16. Failure Resistant Extractor 1 item
  17. Flash Hider 6 items
  18. Forearm Accesory 1 item
  19. Gas Block 4 items
  20. Grip Accessory 1 item
  21. Grip Module 1 item
  22. Handstop 6 items
  23. Lower Parts Kit 4 items
  24. Magazine Release 1 item
  25. Muzzle Brake 8 items
  26. Muzzle Device Accessory 1 item
  27. Patch 1 item
  28. Pistol Grip 3 items
  29. Rail Adapter 1 item
  30. Rail Panel 1 item
  31. Safety Selector 7 items
  32. Stock 4 items
  33. Stock Adapter 7 items
  34. Trigger 3 items
  35. Vertical Grip 4 items
Rail Length
  1. 10" 5 items
  2. 12" 1 item
Size
  1. 3" 1 item
  2. 6" 1 item
  3. 9 Slot 5 items
Thread Pitch
  1. 1/2x28 (9mm) 5 items
  2. 1/2x28 (.22 cal) 5 items
  3. 1/2x36 1 item
  4. 5/8x24 (.30 cal) 1 item
  5. M14x1 LH 1 item
  6. M18x1.5 1 item
Twist Rate
  1. 1:10 1 item
Stock Status
  1. In stock 69 items
  2. Out of stock 35 items
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